Lighting-fixture.



D. CROWNFIELD.

LIGHTING'FIXTURE. APPLICATION FILED 0Ec.4. I9l6.

Patented May 14, 1918.

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DAVID CBOWNFIELD, OF CAMBRIDGE, MASSACHUSETTS.

L1GHTING-FIXTURE.

Application filed December 4, 1916. Serial No. 184,818.

To all whom it may concern:

Be it known that I, DAVID. Cnownr'mm, a citizen of the United States, and resident of Cambridge, in the county of Middlesex and State of Massachusetts have invented new and useful Improvements in Lighting-Fixturespof which the following is a specification.

This invention relates to lighting fixtures adapted to be used either on a wall, ceiling or with a table lamp, and more particularly the invention relates to a lighting fixture for use on the wall of a hospital ward.

It'has been found desirable in many places to illuminate a limited region without radiating light in any appreciable measure outside of the limited area. This is particularly true in hospital wards containing a number of beds, inasmuch as it is frequently necessary to illuminate one bed or the immediate region thereof without projecting much if any light to other portions of the room. For example, it is necessary to illuminate the region surrounding one patient for purposes of examination by a physician or attendant, by a nurse, for reading purposes, etc., at all hours of the night. v 7

- The principal object of my invention is to provide a light fixture which will illuminate a limited region without radiating substantially any light outside of the limited region, and more particularly to illuminate the regionindirectly by throwing light on a wallor other area adjacent the region; Another object is to rovide means whereby the light may be quic ly and easily shifted from onearea to another soasto be readily adrolling, nondust catchingexternal surfaces,

thereby affording no places for the lodgment of dust and germs, andthe attainment of this'end by concealed mechanism And still a further object .is @to provide improved means forv attaching the lamp and shade support to the supporting bracket or other supporting means, and to attain the above mentioned advantages by strong, rigid and durable construction protecting the lamp and the interior oftheshade from dust and dirt. a

Other objects of the invention will -be apparent from the following description taken. with the accompanying drawings, in Wh c -f; r v

Figure 1 is a vertical'longitudinal section Specification of Letters Patent. Pat nted May 14,1918.

of the lighting fixture, parts being shown in elevation;

Fig. 2 is a bottom plan'view of the fixture; Fig. 3 is a bottom plan view showing the screening globe rotated in one direction;

Fig. 4 is a bottom plan'view of the fixture showing the screening other direction; and 4 Fig. 5 is a detail sectional view of improved 'means for attaching. the lamp and shade support to the wall bracket.

globe rotated in fthe In the particular embodiment of the invention herein disclosed, the fixture is illustrated as being applied to a wall support, this being the preferred form; of the invention. The apparatus comprises a hollow supporting stem 1 connected to the supply conduit through the mediumof thehickey joint 2 and the'insulating joint 3, a bell-1 shaped canopy 4 beingthreaded on the stem 1 so as to house the connecting joints and'so as to form a smooth continuous seamless joint at 6 with the support stem 1, all as more fullydisclosed infmy former Patent No. 1,112,197, granted September29, 1914.

The outer end of the. stem 1' isbent downwardly and is provided a with internal threads at its lower end into which is threaded a nipple 7, the nipple also being provided with external threads on its lower end to support the lamp socket 8 and being provided with an'axial opening to-receive the supply wires. The nipple 7 is provided with an enlarged centralportion, preferably tapered on its outer surface so are vfit in the upper; end of thebell shaped-shell t). The

upper end of the shell9' is provided withan internal flange adapted 'tobe clampedber, tween the enlarged portion of the nipple agnd the end .of the stem 1, the parts having such diameters as' tov form a smooth continuous joint atthis point. 7 j i Instead of the lower end, of. bracket 1. being provided with an integral internal sleeve as illustrated. in Fig.; 1,:a.separat e sleeve 10 may be. employed, as illustrated in Fig. 5, the sleeve-1O ibeing internally threaded, as isthe integral-sleeve Fig. l, and also being brazed orotherwisesecured in the lower end of bracketl... p In accordancewith the principal object of my invention, Iprovide a relatively; opaque globe 11- entirely" surrounding the light source 7 contained; within the lamp bulb l .12.

Theglobe 1 1. ispreferably, made substantially E spherical gin contour, although other shapes may be employedwithin the scope of my invention. On one side of the globe is provided a WiHClOW' surrounded by a struck-up flange 13, within which is adapted to fit a transparent closure 14, thelatter'being held in position by any suitable means, as for example by means of the'clips lfi Thus, light is permitted to radiate from the.

light source only in a single lateral direction, and in order to increasethe amount of light radiated through the window, reflecting means is preferably provided within the globe 11, and the reflecting means may, for example, comprise the interior surface 17 of the globe 11, the globe 11 preferably being of metal and the inner surface being polished and lacquered.

The globe 11 ismounted to rotate about the longitudinal axis of the lamp so that the light may be directed either directly on to the wall when in the position illustrated in Figs. 1 and 2 or obliquely to thewall on either side of the fixture as illustrated in Figs: 3' and 4t. A suitable means for rotatably supporting the globe 11 comprises an annular collar 18 surrounding opening 19' in the' upper. end of the globe 11, the collar preferably being formedintegrally with the globe and being folded outwardly as indicated at 21 and? extended downwardly a part of the length of the collar 18 so as to rest on the forward ends of bearing screws 22-, preferably three in number, which project inwardly through threaded openings in the lower end of tl1e'shel'l19LI The globe is secured to the shell 9 by withdrawing the setscrews 22 a'suflicient distance to permit the insertion of'thecollar 18 within the lower end of'the shell- 9', after which they are advanced into such position as to be engaged byrthe out-turned flange 21 OfTthQ collar 18. Thus, the globe isheld in position upon the screws. 22 by engagement of the out-turned part; 21 of the globe between the ends of the screws 22 and the reduced interior of the shell 9, the globe thus being'lf'reeto be rotated through any desired angle but being otherwise firmly held to the shell 9.

In order to afford a smooth continuous external surface for the fixture an outer sliding'cov'er 23 is preferably'pirovi'ded to surround and to be spaced away from the lower end of the supporting. shell 9, thereby whelly to inclose the means for attaching the globe to the shell 9, that is the screws 22", in" the embodiment of the invention herein'illustrated. The central portion of the shell 9; is preferably made substantially cylindrical in contour and the lower end is preferably made' bell-shaped in contour. The sliding cover 23'is adapted to slide vertically on the cylindrical portion of the shell 9, and isso shapedas snu ly to fit the doubly ing cover 23 is slightly flared outwardly so as to clear but to hold in locked position the heads of the screws 22, and it extends downwardly somewhat beyond the lower edge of the shell 9 so as either 'to contact with the globe 1 1 or to come into immediate proximity therewith when the sliding cover is seated upon the bell-shaped lower end of shell 9. p

Considerable heat is dev loped in the globe 11 and shell 9', but it has been found in practice that suflicient venting of;the expanding and contractingair included in H these. inclosures occurs around thecollar l8 and between the screws 22 and the space between the shell 9 and sliding cover 23 even when, as intended, cover 23--seats'y. snugly upon the globe 11 to provide a closure avoidingthe entrance of dust and dirt into the globe 11; I attribute the observed good ve l tilation of the lamp in part to loosening of the sliding cover 23 due to expansion by the heat of the lamp when lighted in excess of the expansion of the less exposed upper cylindrical part of the shell 9.'-.

Thus a lighting fixture is afforded which is adapted'to be mounted at the head ofa hospital bedin such manner as to reflect I y light from the wall of the room, which is usually reflective, and thereby indirectly illuminate the immediate region of a single patient without radiating light to other p015 tions of the room. As indicated in Fig. 1 the axis of the lamp and globeis'not exactly vertical, but is inclined. outwardly and downwardly so that when the light isv a short distance above the patient the light is deflected downwardly as it'str ikes the wall. If the lamp is on the right of the bed the globe may be rotated on the inclined bearing in shell9' to the left to illuminate the patientand itniay be rotated to the right to illuminate a table standing beside. the patient, for example or turned farther around to illuminate a part of theroom above the level of the light. The extent of the out ward-inclination of the light source depends upon its" position with respect tothe region to be illuminated, and'flikewise its exactsizc and its disposition in the globe depend upon the particular use to whi'chthe fixture is to be put; but doardina-lfeaturof the invention is the "disposition of the window in a lateral portion of tl1e'globe,whether directly laterally of the light source or whether somewhat above or below the transverse plane of! the light source, so that the direction of radiation may be regulated by rotating the globe "aroundthe light source. The construction is wholly free from exterior. crevices for the lodgmentof dust, as willbeapparent.

I'cl'aim:

l. Adighting fixture supporting therein alight socket, andhavinga shell.sur rounding said socket, a sliding cover having at one end a sliding engagement with said shell, in combination with a. globe having a collar adapted to be received within said shell and screws on said shell adapted to engage said collar to support said globe, said sliding cover in one position being spaced away from, surrounding and covering said supporting means.

2. A lighting fixture having therein a light socket, a shell surrounding said socket, a sliding cover having at one end a sliding engagement with said shell, in combination with a relatively opaque globe having a window therein and having a collar adapted to be received within said shell, and screws on said shell adapted to engage said collar to support said globe for rotation therein, said sliding cover in one position being spaced away from, surrounding and covering said supporting means.

A lighting fixture having therein a light socket, a shell surrounding said socket, a sliding cover having at one end a sliding engagement with said shell, in combination with a relatively opaque globe having a window therein and a reflecting interior surface, and having a collar adapted to be received within said shell, and screws on said shell adapted to engage said collar to'support said globe for rotation, said sliding cover in one position being spaced away from the end of said shell and surrounding and covering said screws.

A. A lighting fixture having therein a light socket, a shell surrounding said socket, a sliding cover having at one end a sliding engagement with said shell, said shell, cover and the joint between them being of sweeping contour free from lodgment places for dust, in combination with a globe having a collar adapted to be received within said shell, and screws on said shell adapted to engage said collar to support said globe, said sliding cover in one position being spaced away from the end of said shell and surrounding and covering said supporting means.

5. In a depending lighting fixture, a globe extending around the light source, an annular shell surrounding one end of the light source, inwardly extending screws for attaching the globe to the annular shell and a cover surrounding the annular shell and adapted to slide on the shell into engagement with the globe, the cover being spaced away from the shell at its lower end, and making a normally tight joint at an acute angle therewith at its upper end.

6. In a lighting fixture, in combination, means to support the fixture on the wall or ceiling, a wall canopy concealing the supporting means, a stem emerging from said wall canopy, a lamp socket attached to the stem, a shell concealing the socket having screws at its lower extremityto exteriorly support a shade, and a sliding cover to conceal the screws and hold them locked when in supporting relation to the shade, the wall canopy, supporting stem, socket cover and shell, sliding cover and shade all having a glowing non-dust catching outline and surace.

7. In a lighting fixture, in combination, means to support the fixture on the wall or ceiling, a wall canopy concealing the supporting means, a stem emerging from said wall canopy, a lamp socket attached to the stem, a shell concealing the socket having screws at its lower extremity to exteriorly support a shade, a closed continuous globe shade supported thereby, and a sliding cover to conceal the screws and hold them locked when in supporting relation to the shade; the wall canopy, supporting stein, socket cover and shell, sliding cover and shade all having a flowing non-dust catching outline and surface.

8. A lighting fixture having therein a socket concealing member comprising an inner shell and an outer cover, the inner shell .being formed to secure even, unbroken continuation with its supporting and abutting members, and its lower extremity having screws interiorly entering to outwardly engage the neck of a supported shade, the outer cover being adapted to slide backward and forward over the inner shell and over the screws supporting the shade when they are positioned to support the shade, whereby to hold them in locked position.

9. A lighting fixture having therein a socket concealing member comprising an illner shell and an outer cover, the innershell being formed to secure even, unbroken continuation with its supporting and abutting members, and its lower extremity having screws interiorly entering to outwardly engage the neck of a. supported shade, the

outer cover being adapted to slide backward and forward over the inner shell and. over the screws supporting the shade when they are positioned to support the shade, whereby to hold them in locked position, the outer shell having such relation to the inner shell and the supported shade that when in its lowered position it will come to a dusttight seat against the shade.

Signed by me at Boston this 29th day of November 1916.

DAVID GROWN FIELD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

